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Zinc II Oxide

A colourless ...

Question

A colourless aqueous solution contain nitrates of two metal, when it is added to an aqueous solution of $N a C l$ , a white precipitate ws formed. This precipitate was found to be partially soluble in hot water to give a residue $P$ and a solution $Q$ . The residue $P$ was solublein aq. in $N H_{3}$ and also in excess sodium thiosulfate. The hot solution $Q$ gave a yellow precipitate with $K I$ . The metals $X$ and $Y$ , respectively, are:

A

A g and P b

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B

A g and C d

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C

C d and P b

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D

C d and Z n

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Solution

The correct option is A $A g and P b$
$x = A g; y = P b; P = A g C l : Q = P b C l_{2}$
(1) $\begin{matrix} A g N O_{3} & + N a C l & \to & A g C l ↓ + & N a N O_{3} x & P \end{matrix}$
(2) $\begin{matrix} A g C l (s) & + & 2 N H_{3} & \to {[A g {(N H_{3})}_{2}]}^{+} C l^{-} (P) & (soluble complex) \end{matrix}$

(3) $\begin{matrix} A g C l + & 2 N a_{2} S_{2} O_{3} & \to & N a_{3} [A g (S_{2} O_{3})] & + N a C l Residue P & (E x c e s s) & (Soluble complex) \end{matrix}$
(4)
$\begin{matrix} P b {(N O_{3})}_{2} & + 2 N a C l \to P b C l_{2} ↓ + 2 N a N O_{3} (y) & white ppt (Q) \end{matrix}$

(5) $\begin{matrix} P b C l_{2} & + & 2 K I \to & P b I_{2} + & 2 K C l (hot solution) & yellow ppt Q \end{matrix}$

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